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National Instruments SCXI-1104 Manual
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National Instruments SCXI-1104 Manual

National Instruments SCXI-1104 Manual

Calibration procedure
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CALIBRATION PROCEDURE
SCXI -1104
™
Introduction
What Is Calibration?
Why Should You Calibrate?
How Often Should You Calibrate?
™
™
CVI
, LabVIEW
, National Instruments
names mentioned herein are trademarks or trade names of their respective companies.
370267A-01
This document contains information and step-by-step instructions for
verifying and calibrating the National Instruments SCXI-1104 signal
conditioning module.
Calibration is a procedure of reading offset and gain errors from a device
and updating special analog calibration circuitry that corrects these errors.
National Instruments calibrates every SCXI-1104 module at the factory.
During the factory calibration process, the calibration constants are stored
in the non-volatile memory of the device. These values are loaded from
memory and used as needed by the device.
Offset and gain errors drift with time and temperature, which could
invalidate the factory-set calibration of a device. Calibration restores the
device to its specified accuracy.
The measurement accuracy requirements of your application
determine how often you should calibrate your SCXI-1104 module.
National Instruments recommends you perform a complete calibration
at least once every year. You can shorten this interval to six months or
90 days, based on the demands of your application.
™
™
™
, ni.com
, NI-DAQ
, and SCXI
© Copyright 2000 National Instruments Corp. All rights reserved.
™
are trademarks of National Instruments Corporation. Product and company
July 2000

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Summary of Contents for National Instruments SCXI-1104

  • Page 1 Calibration is a procedure of reading offset and gain errors from a device and updating special analog calibration circuitry that corrects these errors. National Instruments calibrates every SCXI-1104 module at the factory. During the factory calibration process, the calibration constants are stored in the non-volatile memory of the device.

  • Page 2: Software And Documentation

    If you do not have custom connection hardware, you will need a connector block Note such as the National Instruments SCXI-1300, a shielded 68-pin connector cable, a 50-pin ribbon cable, a 50-pin breakout box, and an SCXI adapter. These components give easy access to the individual pins on the SCXI-1104 front and rear connectors.

  • Page 3: Test Conditions

    Start»Programs»National Instruments DAQ»NI-DAQ Help. The user manual provides instructions on installing and configuring National Instruments DAQ devices. This manual also includes detailed information on creating applications that use the NI-DAQ driver. These are your primary references for writing your calibration utility. For further information on the products you are calibrating, refer to your device user manuals.
  • Page 4 The verification procedure determines how well the SCXI-1104 module is meeting its specifications. You can use this information to select the appropriate calibration interval for your application. Complete the following steps to verify the operation of your SCXI-1104: Read the Test Conditions section earlier in this document.
  • Page 5 (CH0+) is pin C32. The negative input for channel 0 (CH0–) is pin B32. If you are using an SCXI-1300 breakout module connected to the SCXI-1104, connect your calibrator to the CH0+ and CH0– inputs. Call to configure the module for SCXI_Single_Chan_Setup single-channel measurements.
  • Page 6 Offset Errors and Calibration Constants, to adjust your module. 13. Repeat steps 7 through 12 for the remaining channels. You have now completed verifying the operation of your SCXI-1104. Note If all channels fall within the upper and lower limits, your module does not need to be adjusted.
  • Page 7 CH0+. The negative input for channel 0 is pin B32 which is labeled CH0–. If you are using an SCXI-1300 breakout module connected to the SCXI-1104, connect your calibrator to the CH0+ and CH0– inputs. Connect your DMM to the positive output on pin 3 (MCHO+) and negative output on pin 4 (MCHO–) on the rear panel connector.
  • Page 8 Complete the following steps to adjust the calibration constants on your SCXI-1104: Call to create and store the new calibration SCXI_Cal_Constants constants in the SCXI-1104 memory. Set the following parameters: • SCXIchassisID—The ID assigned by Measurement & Automation Explorer •...
  • Page 9 SCXI-1104 • binary1 and binary2—The first and second binary readings for the gain values that you are about to save on the SCXI-1104 • calConst1 and calConst2—These are return values.

  • Page 10: Front And Rear Panel Diagrams

    Front and Rear Panel Diagrams Figure 1 shows the pin assignments for the SCXI-1104 module front panel connector. Figure 2 shows the pin assignments for the SCXI-1104 rear panel connector. CGND CH0– CH0+ CH1– CH1+ CH2– CH2+ CH3– CH3+ CH4–...

  • Page 11: Specifications

    Figure 2. SCXI-1104 Rear Panel Connector Pin Assignments Specifications The following table contains test specifications for the SCXI-1104 signal conditioning module. If the device has been calibrated within the last year, the Test Point value should fall between the Upper Limit and Lower Limit values.